Sealed-beam headlight employing a halogen lamp

ABSTRACT

A gas-tight vehicular headlight includes a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of the cupshaped reflector in the region of the smaller open end. A diffuser glass closes off the larger end of the reflector. A halogen lamp is at least in part located within the interior of the cup-shaped reflector. The halogen lamp is connected to the reflector at the neck portion of the reflector in non-releasable seal-tight manner.

United States Patent Schmidt et al.

1 1 SEALED-BEAM HEADLIGHT EMPLOYING A HALOGEN LAMP [75] Inventors: Hans-Joachim Schmidt, Ditzingen;

Ernst Merkl, Stuttgart; Gerhard Lindae, Leonberg, all of Germany [73] Assignee: Robert Bosch GmbH, Stuttgart,

Germany [22] Filed: July 5, 1973 [21] App], No; 376,927

[30] Foreign Application Priority Data Oct. 11, 1972 Germany .1 2249630 July 5, 1972 Germany 2232905 [52] US. Cl. 240/41 SB; 240/7.1 R; 313/113 [51] Int. Cl. F2lm 3/00 [58] Field of Search 240/41 SB, 7.1 R, 41 BM, 240/114, 313/113 [56] References Cited UNTTED STATES PATENTS 2,148,315 2/1939 Wright 240/41 SB 1 Nov. 4, 1975 2,245,782 6/1941 Holloway 240/41 BM 2,317,035 4/1943 Dana 313/113 X 2,464,990 3/1949 Plagge 1 1 1 .1 313/113 3,010,045 11/1961 Plagge et a1 1 1 1 4 240/41 SB 3,488,543 1/1970 Ridder et 313/113 3,688,103 8/1972 Daumuller 240/41 SB 3,725,698 4/1973 Craig H 240/41 58 Primary ExaminerRichard L, Moses Attorney, Agent, or FirmMichael S. Striker [57] ABSTRACT A gas-tight vehicular headlight includes a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of the cup-shaped reflector in the region of the smaller open end. A diffuser glass closes ofi the larger end of the reflector. A halogen lamp is at least in part located within the interior of the cup-shaped reflector. The halogen lamp is connected to the reflector at the neck portion of the reflector in non releasable seal-tight manner 15 Claims, 8 Drawing Figures US. Patent Nov. 4, 1975 Sheet 1 of4 3,917,939

U.S. Patent Nov. 4, 1975 Sheet 2 of4 3 917 939 US. Patent Nov. 4, 1975 Sheet 3 014 3,917,939

US. Patent Nov. 4, 1975 Sheet4 of4 3,917,939

SEALED-BEAM HEADLIGHT EMPLOYING A HALOGEN LAMP BACKGROUND OF THE INVENTION The invention relates to gas'tight vehicular headlights with metallic or metal-layer coated reflectors. More particularly the invention relates to headlights of this type including a diffuser glass or lens cemented to the rim of the front end of the reflector, with the rear end of the reflector having a neck portion extending in direction generally axially of the headlight, with the headlight further including a lamp bulb, a bulb holder member holding the bulb, and a lamp support member holding the lamp assembly in proper position.

More and more, vehicular headlights are being produced according to gas-tight designs. Such design results in a longer useful life of the headlamp than is achieved with headlights of the disassemblable or removable-bulb" type. These gas-tight headlights, often referred to as "sealed-beam" headlights, are formed as a non-disassemblable unit comprised of a reflector, a light diffuser lens or glass, and various sealing ring elements and the like, often with the inclusion in the interior of the headlight of a suitable inert gas to protect the headlight components, especially the reflective surface of the reflector member which may be very vulnerable to the deleterious effects of various atmospheric gases.

Headlights of this type become completely useless when even a small defect develops and must be entirely replaced. Nevertheless, they are becoming ever more popular because they do in fact prevent the entrance of deleterious gases and atmospheric moisture. As a result, loss of reflecting capability of the reflector, and even the real possibility of rusting of the inner reflector surface, as well as the fouling of the interior surface of the diffuser glass, are for the most part entirely avoided, which is of real importance nowadays in view of the serious air pollution situation.

A headlight of the sealed-beam variety is already known in which the diffuser glass is cemented to the front rim of the reflector, with the electrodes leading to the filament of the headlight lamp passing through a metal bulb holder in completely air-tight manner, with a cap-like lamp support member being welded to the reflector at the back side thereof, to close off the rear open end of the reflector. Other known headlights of this type contain a lamp provided with an annular groove into which the neck of the reflector is cemented in by means of a sealing mass; in the same way, the front rim of the reflector is cemented into an annular groove extending around the rim of the diffuser glass. This type of construction has the significant advantage that the edges of the reflector, which otherwise might be particularly susceptible to rusting, are embedded within the sealing material and therefore not exposed to the atmosphere.

Another known construction of the sealed-beam type makes use ofa glass bulb holder member which accommodates the electrodes of the lamp bulb and which is provided with a metal centering ring positioned at the rear opening of the cup-shaped reflector. With this construction, a glass bulb can be mounted on the ring, so that the electrodes with their filaments are encapsulated within such glass bulb within the interior of the reflector. With this construction, a relatively simple orientation of the filaments with reference to the re- 2 flector can be accomplished, without the need for supplementary adjusting steps to take into account the individual characteristics of a particular lamp.

SUMMARY OF THE INVENTION It is the general object of the invention to provide a headlight construction of the aforementioned kind, in sealed-beam form and using as light source a halogen lamp.

It is a more particular object of the invention to provide a vehicular headlight which can be assembled in such a manner that the halogen lamp is introduced into the cup-shaped reflector and properly positioned with respect thereto without the need for any difficult or skillful centering operations, and especially without the need for any special centering devices or equipment.

These objects, and others which will become more understandable from the description which follows, can be met, according to one general concept of the invention, by providing a gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of the cup-shaped reflector in the region of the smaller open end. A diffuser glass closes off the larger open end. A diffuser glass closes off the larger open end. A halogen lamp is at least in part located within the interior of the cup-shaped reflector. Means are provided for connecting the halogen lamp to the reflector at the neck portion of the reflector in non-dismountable sealtight manner.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in con nection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS:

FIG. 1 shows the components of one gas-tight vehicular headlight;

FIG. 2 shows a portion of the headlight of FIG. I, on an enlarged scale;

FIG. 3 shows a modification of the portion shown in FIG. 2;

FIG. 4 shows a further manner of connecting the halogen lamp to the reflector;

FIG. 5 shows a construction similar to that of FIG. 4, but somewhat modified;

FIG. 6 shows a further construction;

FIG. 7 shows another construction; and

FIG. 8 shows still another construction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a headlight 10 of gas-tight design having an optical axis 0-0, a reflector 11 formed of sheet steel having a larger open end through which the projected beam passes provided with a bent rim I2 into which is lodged and cemented the rim of a diffusing lens 14. In the region of the smaller open end of the reflector (the right-hand end as seen in FIG. I), the headlight has a cylindrical neck 15 which accommodates a lamp support member 16 of formed metal. This lamp support member 16 carries on its inner side a lamp bulb 17 of a halogen lamp, detail of its construction is shown in 3 the British Patent Specification No. 1,236,507 including in its interior a bifilar lighting coil 18. A light shield 20 is supported by a member 19 to partially shield and block the direct rays of the lamp.

FIG. 2 illustrates a portion of the arrangement of FIG. 1, on a larger scale. The reflector II has a neck 15 extending in direction parallel to the optical axis -0 and accommodates a lamp support member 16. Lamp support members 16 is formed of deep-drawn sheet metal and is provided at its base portion (rightmost portion in FIG. 2) with three openings 22 having beaded rims. The lamp support member 16 further comprises a generally cylindrical portion 23, from which extends in radially outwards direction an annular flange 24, from which in turn there extends in direction parallel to the optical axis 0-0 a cylindrical portion 25. The edge of neck and the edge of the cylindrical portion 25 are welded togetther to form an annular weld seam 26. A holder member 28 has a radially outwardly extending annular flange portion 29 positioned against the annular flange portion 24, and has at its radially inner side a funnel-shaped portion 30. Preferably, the flange 29 is welded to the flange 24. The bifilar lamp I8 is a specially designed halogen lamp and includes a hermetically sealed bulb portion 17. A section 32 of bulb portion 17 has a squeezed-flat configuration and is held in place in funnel-shaped portion by means of cement 33. Three electrodes 34 lead out of the section 32, only two being shown in their entirety. Each electrode 34 passes through a pipe-shaped member 35 which projects through a respective one of the three rimmed openings 22 in the base portion 21 of the lamp support member 16. The space around each pipeshaped member 35 is sealed by a glass melt 36. An L- shaped plug member 37 has a shorter arm 38 slipped over the pipe-shaped element 35, the member 37 being rigidly connected to the member 35 at the end of the latter, as well as to the respective electrode 34, preferably by soldering.

The support member 19 for the light shield 20 (FIG. 1) is welded onto the lamp holder member 28. The circular weld seam 26 between the reflector 11 and the lamp support member 16 must be continuous and complete, in order to effect gas-tight sealing of the interior 27 of the headlamp. An alternative design is illustrated in FIG. 3, where in the cylindrical portion 40 of the lamp support member 41 a groove 42 is formed to accommodate an O-ring seal 43, so as to form the requisite seal between the flange 15 and the reflector 11. The lamp support member 4] and the reflector 11 accordingly need be soldered or welded together only at a few points. Preferably, if a construction like that of FIG. 3 is selected, the holder 28 in the region of the groove 42 should project inwards, so as to form a U- profiled channel for the O-ring 43, so that the latter can be held against axial shifting, to permit the employment of greater contact pressures.

A further embodiment of the invention is depicted in FIG. 4. In this embodiment, the bulb holder member is a ceramic body 45. The ceramic bulb holder member 45 has a hollow cylindrical portion 46 and a base portion 47. The base portion 47 has an opening 48. The bifilar lamp I8 is held in place at its section 32 by means ofcement 33, with its three electrodes 49 leading out of the rear of the lamp. The lamp support member is here a glass plate 50 having a flat base portion 51 and a ringshaped forwardly projecting rim portion 52. The generally cylindrical rim portion 52 is provided with an annular groove 53 of U-shaped cross-section. The cylindrical neck portion 15 of the reflector lies against the radially inner wall 54 of the circular groove 53. The remainder of the circular groove 53 is filled with a plastic material 55. The plastic material 55 establishes a gastight connection between the neck portion 15 and the rim portion 52 of the lamp holder member 50. The base portion 51 of the glass plate 50 has three openings 72, each sealed off by a respective cap 56 of stepped narrowing configuration, with the respective cap being embedded into the material of the glass plate 50 to establish the desired sealing effect. The plug members 57 for the headlight each have a circular section 58 pushed over the respective cap 56 and connected to the latter by soldering.

The ceramic bulb holder member 45, in the general plane of its base 47, is provided with three radially outwardly projecting plate-shaped portions 60, of which one is shown. Mounted on each of the three plateshaped portions 60 is a preferably angled support 61 secured to the respective portion 60 by means of a tubular rivet 62. The support 61 projects with its other end into the respective neighboring cap member 56 and is soldered to the cap at such other end. With this construction, each electrode 49 is conductively connected to a respective one of the supports 61 at a connection point 63. In this embodiment, the supporting member 19 for the light shield 20 is likewise secured to the plate-shaped projection 60 by the tubular rivet 62.

FIG. 5 illustrates another manner of securing the glass plate here designated by numeral 64, to the reflector 65. In this embodiment, the neck of the reflector assembly 65, 67 is formed by a discrete holding ring member 67. The ring member 67 has a generally S- shaped profile and serves to effect the requisite gastight seal for the headlamp. In particular, the smaller loop 68 of the S, i.e., the radially innermost rim portion of the ring 67, accommodates and holds in place the radially inner rim of the reflector member 65. The space 70 formed between the members 65 and 67, and also the space 71, are filled with masses of cementing material, preferably silicon ribber or O-rings, and serve to seal the connection between the reflector 65 and the glass plate 64.

FIG. 6 shows another embodiment of the headlight construction according to the invention. This headlight construction includes a halogen lamp having a bulb portion 75, with plug members 77 for the headlight being inserted into the bulb holder member 76. The lamp holder member 78, in particular its generally cylindrical radially innermost portion, lies tightly against the circumferential periphery of the bulb holder mem ber 76. The lamp holder member 78 has a swan-neck shape in profile, with a rim portion 79 extending in substantially axial direction. The neck 15 of the reflector 11 has dimples 81 by means of which a force-fit connection with an annular flange member is effected, to form a hollow annular shell into which plastic material is poured or otherwise admitted. When a lamp bulb is inserted into the headlamp assembly, a radially inwardly projecting member 82 bent out from the reflector neck 15 engages a depression 83, to effect a proper orientation of the lamp with respect to the reflector. The rim 79 of the lamp support member 78, with its entire circular edge, penetrates into an annular mass of plastic material 55, and thereby establishes a dependable seal between the lamp support member 78 and the reflector 1 1. The annular flange member 80 is provided with three tabs 84, of which only one is shown in FIG. 6. After a lamp has been installed in the headlamp assembly, the tabs 84 are bent into the position shown in FIG. 6, to grip the lamp support member 78 from behind and guarantee a precise positioning with respect to the reflector neck 15.

FIG. 7 shows another construction. In this construction, the neck of the reflector ll accommodates a halogen lamp, the bulb 17 of the halogen lamp having a section 32 cemented into the bulb holder member 85, with the latter being closed off in seal-tight manner by a base cap 86, the connection between the electrodes 34 and the plug members 77 being established by means of soldering. In FIG. 7, the bulb holder member 85 has a positioning projection 87 which engages a bent portion of the rim of the reflector neck portion 15, so as to properly mount the lamp in the reflector 11. Furthermore, the base cap 86 of the bulb holder 85 is preferably provided with three projections 88 which serve to precisely establish the axial position of the bulb holder 85. When the bulb is inserted into the bulb holder 85, its axial position is precisely fixed, and then it is surrounded with a jacket 89 of plastic material, by casting or molding or in other manner, to thereby establish a durable and rigid connection with the reflector. To establish an internal keying of the jacket 89 and the neck 15, the neck is provided with several small slots 90, formed by stamping out or in other manner; when the jacket 89 is formed around the neck of the reflector, the small slots 90 become filled with the material of the jacket 89, to effect keying.

FIG. 8 shows another construction in which the lamp of the headlight is seal-tightly connected to the reflector. In this construction, the lamp with its bulb 17, or more specifically the portion 32 thereof, is surrounded by a cap member 92. The cap member 92 is slipped over and supported by a bulb support member 93 whose rear section is closed off by an end plate 94. This end plate 94 is provided with a press-fitted guide member 95 for each of the electrodes 34 of the lamp. Each guide member 95 has a bore through which the respective lamp electrode passes, and is furthermore provided with an end contact 96 which receives and holds a plug member 37. It will be noted that between the main reflective portion of the reflector 11 and its cylindrical neck portion 15, the reflector comprises a portion 97 having the shape of a hollow truncated cone. A tinned sleeve 98 serves as the lamp support member. In assembling the illustrated construction, the sleeve member 98 initially has a generally cylindrical configuration with a flange portion. It is pushed into the neck 15 of the reflector from behind the reflector, whereafter its forward rim is outwardly bent, so that its outer peripheral surface lies tightly against not only the cylindrical neck portion 15 but also against the truncated-cone portion 97 of the reflector member II. The annular sleeve 98 is thereupon heated by inductive heating until its tin coating melts and forms a tight seal with the bulb holder member 93; if necessary, solder can be used to supplement this melt-sealing, or instead of it. A clamping ring 101 has a handle-shaped portion 103. The supporting member 19 for the light shield is slid under the handle-shaped member 103 and is engaged and held between the latter and the adjoining portions of the clamping ring 101. The rearward end of the supporting member 19 for the light shield extends backwards almost up to the location of the member 98. The thusly centered lamp bulb 17 with its bulb holder 93 is connected to the reflector 11 in seal-tight manner by pouring a cementing mass into the tapering annular channel 99 surrounding the rear portion of the bulb holder 93. This serves not only to connect the members 93 and 11, but also to additionally secure in position the supporting member 19 for the light shield of the headlamp.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of construction differing from the types described above.

While the invention has been illustrated and described as embodied in a vehicular headlamp, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired is:

I. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cupshaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector said halogen lamp comprises a bulb having a rear portion and electrodes leading out from said bulb through said rear end thereof; and means connecting said halogen lamp to said reflector at said neck portion thereof in nondismountable seal-tight manner, and wherein said means comprises a bulb holder member, said rear end portion of said bulb being accommodated in said bulb holder member and maintained in position therein by a cementing material, and wherein said means further comprises a lamp support member fixedly connecting said bulb holder member to said neck portion of said reflector and holding said halogen lamp in a predetermined position with respect to said neck portion, and wherein said electrodes are gas-tightly connected with said lamp support member, and further comprising plug members connected to said electrodes at the rear side of said headlight.

2. A headlight as defined in claim 1, wherein said lamp support member has a base portion provided with a plurality of openings, one for each electrode of said halogen lamp, with the openings in said base portion of said lamp support member having beaded rims, and further including discrete. pipe-shaped members passing through said openings and held in position in such openings in seal-tight manner by means of a glass melt, each of said electrodes passing through and being solder-connected to a respective one of said pipe-shaped members.

3. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cupshaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector, wherein said halogen lamp comprises a bulb having a rear end portion; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, and wherein said means comprises a bulb holder member, said rear end portion of said bulb being accommodated in said bulb holder member and main tained in position therein by a cementing material, and wherein said means further comprises a lamp support member fixedly connecting said bulb holder member to said neck portion of said reflector and holding said halogen lamp in a predetermined position with respect to said neck portion.

4. A headlight as defined in claim 3, wherein said bulb holder member is comprised of a funnel-shaped portion defining with said rear end portion of said bulb an annular groove surrounding said bulb, and cementing material filling said groove and connecting said bulb holder member to said rear end portion of said bulb, and wherein said bulb holder member is further comprised of a radially outwardly projecting flange projecting from said funnel-shaped portion thereof and connected to said lamp support member to be supported in position by the latter.

5. A headlight as defined in claim 3, wherein said lamp support member is formed of sheet metal and is configurated to have an outwardly bent rim portion, and further comprising an annular weld searn connecting said outwardly bent rim portion to said neck portion.

6. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cupshaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said halogen lamp has a shell, and wherein said means comprises a lamp support member surrounding and gas-tightly connected to said shell, and wherein said means further includes an annular member in contact with and fitted against said neck portion of said reflector and defining with said neck portion an annular channel, a sealing material in said annular channel to effect a seal between said annular member and said neck portion, and wherein said lamp support member has an annular rim penetrating into said sealing material in said annular channel, and wherein said annular member further includes a plurality of bendable tabs bent into such a position as to hold said lamp support member in such a manner as to oppose withdrawal of said annular rim from said sealing material.

7. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cupshaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said means comprises a lamp support member supporting said lamp and having a generally circular rim portion and an annular groove extending around said rim portion, said groove facing in forward axial direction of the headlight, and sealing material in said annular groove, and wherein said neck portion of said reflector extends into said annular groove, with said sealing material forming a seal-tight connection between said neck portion of said reflector and said rim portion of said lamp support member.

8. A headlight as defined in claim 7, wherein said lamp support member is made of glass.

9. A headlight as defined in claim 7, wherein said annular groove has a radially inner side wall and a radially outer side wall, and wherein said neck portion of said reflector penetrates into said groove and lies tightly against the radially inner side wall of the groove.

10. A headlight as defined in claim 7, wherein said lamp support member is made of glass, and wherein said halogen lamp has a plurality of lamp electrodes, and wherein said glass support member has a plurality of openings, one for each of said electrodes, a plurality of cap members, one for each of said openings, each cap member having a rim portion penetrating into the glass material of the lamp support member, and each electrode being soldered to the respective cap member, and further comprising a plurality of plug members, one for each electrode, in electrical engagement with the respective electrodes.

11. A headlight as defined in claim 7, wherein said halogen lamp comprises a bulb and lamp electrodes, and wherein said means comprises a bulb holder member of ceramic material having a generally cup-shaped configuration and having a base portion with an opening for the passage therethrough of said lamp electrodes.

12. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cupshaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cupshaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said halogen lamp comprises a bulb, and wherein said means comprises a bulb holder member surrounding and holding said bulb, said bulb holder member having a rim portion extending in generally axial direction and tightly fitted against the inner surface of said neck portion, and wherein said means further comprises a jacket of plastic material closing off said smaller open end of said reflector and surrounding and contacting in seal-tight manner the outer surface of said neck portion.

13. A headlight as defined in claim 12, whereinsaid neck portion has a recess, and wherein said bulb holder member has a projecting portion received in said recess to properly orient said bulb, said bulb holder member having an open rear end, and further including a base cap member for said halogen lamp closing off said open rear end of said bulb holder member and having a plurality of projections, and wherein said neck portion is provided with a corresponding plurality of recesses receiving the projections of said base cap member.

14. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup- 9 shaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said reflector in the region of said neck portion includes a portion having the shape of a truncated cone, and wherein said means includes an annular sleeve serving as a lamp holder member tightly fitting against the inner surface of said neck portion and also against said portion having the shape of a truncated cone, and wherein said halogen lamp comprises a bulb, and wherein said means further comprises an annular bulb holder member surrounding and connected to said bulb and soldered to said lamp holder member, the outer periphery of said bulb holder member defining together with the inner periphery of said reflector an annular channel, and further including an annular mass of sealing material establishing a seal-tight connection between said bulb holder member and said reflector.

15. A headlight as defined in claim 14, and further including a clamping ring surrounding said bulb-holder member, a light shield for said halogen lamp, a supporting member for supporting said light shield, and means provided on said clamping ring for holding said supporting member, said clamping ring penetrating into said mass of sealing material.

i i i i 8 

1. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup-shaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector said halogen lamp comprises a bulb having a rear portion and electrodes leading out from said bulb through said rear end thereof; and means connecting said halogen lamp to said reflector at said neck portion thereof in nondismountable seal-tight manner, and wherein said means comprises a bulb holder member, said rear end portion of said bulb being accommodated in said bulb holder member and maintained in position therein by a cementing material, and wherein said means further comprises a lamp support member fixedly connecting said bulb holder member to said neck portion of said reflector and holding said halogen lamp in a predetermined position with respect to said neck portion, and wherein said electrodes are gas-tightly connected with said lamp support member, and further comprising plug members connected to said electrodes at the rear side of said headlight.
 2. A headlight as defined in claim 1, wherein said lamp support member has a base portion provided with a plurality of openings, one for each electrode of said halogen lamp, with the openings in said base portion of said lamp support member having beaded rims, and further including discrete pipe-shaped members passing through said openings and held in position in such openings in seal-tight manner by means of a glass melt, each of said electrodes passing through and being solder-connected to a respective one of said pipe-shaped members.
 3. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup-shaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector, wherein said halogen lamp comprises a bulb having a rear end portion; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, and wherein said means comprises a bulb holder member, said rear end portion of said bulb being accommodated in said bulb holder member and maintained in position therein by a cementing material, and wherein said means further comprises a lamp support member fixedly connecting said bulb holder member to said neck portion of said reflector and holding said halogen lamp in a predetermined position with respect to said neck portion.
 4. A headlight as defined in claim 3, wherein said bulb holder member is comprised of a funnel-shaped portion defining with said rear end portion of said bulb an annular groove surrounding said bulb, and cementing material filling said groove and connecting said bulb holder member to said rear end portion of said bulb, and wherein said bulb holder member is further comprised of a radially outwardly projecting flange projecting from said funnel-shaped portion thereof and connected to said lamp support member to be supported in position by the latter.
 5. A headlight as defined in claim 3, wherein said lamp support member is formed of sheet metal and is configurated to have an outwardly bent rim portion, and further comprising an annular weld seam connecting said outwardly bent rim portion to said neck portion.
 6. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup-shaped reflector in the region of said smaLler open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said halogen lamp has a shell, and wherein said means comprises a lamp support member surrounding and gas-tightly connected to said shell, and wherein said means further includes an annular member in contact with and fitted against said neck portion of said reflector and defining with said neck portion an annular channel, a sealing material in said annular channel to effect a seal between said annular member and said neck portion, and wherein said lamp support member has an annular rim penetrating into said sealing material in said annular channel, and wherein said annular member further includes a plurality of bendable tabs bent into such a position as to hold said lamp support member in such a manner as to oppose withdrawal of said annular rim from said sealing material.
 7. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup-shaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said means comprises a lamp support member supporting said lamp and having a generally circular rim portion and an annular groove extending around said rim portion, said groove facing in forward axial direction of the headlight, and sealing material in said annular groove, and wherein said neck portion of said reflector extends into said annular groove, with said sealing material forming a seal-tight connection between said neck portion of said reflector and said rim portion of said lamp support member.
 8. A headlight as defined in claim 7, wherein said lamp support member is made of glass.
 9. A headlight as defined in claim 7, wherein said annular groove has a radially inner side wall and a radially outer side wall, and wherein said neck portion of said reflector penetrates into said groove and lies tightly against the radially inner side wall of the groove.
 10. A headlight as defined in claim 7, wherein said lamp support member is made of glass, and wherein said halogen lamp has a plurality of lamp electrodes, and wherein said glass support member has a plurality of openings, one for each of said electrodes, a plurality of cap members, one for each of said openings, each cap member having a rim portion penetrating into the glass material of the lamp support member, and each electrode being soldered to the respective cap member, and further comprising a plurality of plug members, one for each electrode, in electrical engagement with the respective electrodes.
 11. A headlight as defined in claim 7, wherein said halogen lamp comprises a bulb and lamp electrodes, and wherein said means comprises a bulb holder member of ceramic material having a generally cup-shaped configuration and having a base portion with an opening for the passage therethrough of said lamp electrodes.
 12. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup-shaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said halogen lamp comprises a bulb, and wherein said means Comprises a bulb holder member surrounding and holding said bulb, said bulb holder member having a rim portion extending in generally axial direction and tightly fitted against the inner surface of said neck portion, and wherein said means further comprises a jacket of plastic material closing off said smaller open end of said reflector and surrounding and contacting in seal-tight manner the outer surface of said neck portion.
 13. A headlight as defined in claim 12, wherein said neck portion has a recess, and wherein said bulb holder member has a projecting portion received in said recess to properly orient said bulb, said bulb holder member having an open rear end, and further including a base cap member for said halogen lamp closing off said open rear end of said bulb holder member and having a plurality of projections, and wherein said neck portion is provided with a corresponding plurality of recesses receiving the projections of said base cap member.
 14. A gas-tight vehicular headlight comprising, in combination, a cup-shaped reflector having a smaller open end and a larger open end and a neck portion extending in direction substantially axially of said cup-shaped reflector in the region of said smaller open end; a diffuser glass closing off said larger open end; a halogen lamp at least in part located within the interior of said cup-shaped reflector; and means connecting said halogen lamp to said reflector at said neck portion thereof in non-dismountable seal-tight manner, wherein said reflector in the region of said neck portion includes a portion having the shape of a truncated cone, and wherein said means includes an annular sleeve serving as a lamp holder member tightly fitting against the inner surface of said neck portion and also against said portion having the shape of a truncated cone, and wherein said halogen lamp comprises a bulb, and wherein said means further comprises an annular bulb holder member surrounding and connected to said bulb and soldered to said lamp holder member, the outer periphery of said bulb holder member defining together with the inner periphery of said reflector an annular channel, and further including an annular mass of sealing material establishing a seal-tight connection between said bulb holder member and said reflector.
 15. A headlight as defined in claim 14, and further including a clamping ring surrounding said bulb-holder member, a light shield for said halogen lamp, a supporting member for supporting said light shield, and means provided on said clamping ring for holding said supporting member, said clamping ring penetrating into said mass of sealing material. 